Other
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...352l..45b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 352, April 1, 1990, p. L45-L48.
Other
13
Spectrum Analysis, Stellar Spectra, Variable Stars, White Dwarf Stars, Brown Dwarf Stars, Fourier Analysis, Light Curve, Power Spectra, Stellar Atmospheres, Stellar Temperature
Scientific paper
The paper reports the discovery that the DA white dwarf GD 165, recently identified as possibly having a brown dwarf companion, is also a ZZ Ceti variable. The analysis of two independent photometric observations shows brightness variations of up to 0.1 mag on time scale of 200-1800 s. Fourier analysis of the light curves indicates that, as is true in general for ZZ Ceti variables, multiple periodicities are present on both nights and the period structure of the star can change on a time scale of 2 days. In the first run, Fourier analysis shows a multiperiodic low-frequency spectrum, while on the second run, the low-frequency spectrum is dominated by an 1800-s period, which is the longest period ever observed in a ZZ Ceti white dwarf. A high-frequency peak of variable amplitude corresponding to a period of 120 s is present in both runs as well. The time variability of the period structure is interpreted as interaction between pulsation modes, as is seen in other ZZ Ceti variables.
Bergeron Pierre
McGraw John T.
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